Input: mousedev - add a schedule point in mousedev_write()
syzbot was able to trigger rcu stalls by calling write() with large number of bytes. Add a cond_resched() in the loop to avoid this. Link: https://lkml.org/lkml/2018/8/23/1106 Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: syzbot+9436b02171ac0894d33e@syzkaller.appspotmail.com Reviewed-by: Paul E. McKenney <paulmck@linux.ibm.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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@ -707,6 +707,7 @@ static ssize_t mousedev_write(struct file *file, const char __user *buffer,
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mousedev_generate_response(client, c);
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spin_unlock_irq(&client->packet_lock);
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cond_resched();
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}
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kill_fasync(&client->fasync, SIGIO, POLL_IN);
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